<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>無標題文檔</title></head><script type="text/javascript">function count(){ var txt1=parselnt(document.getElementById("txt1").value); var txt2=parselnt(document.getElementById("txt2").value); var select=document.getElementById("select").value; var result; switch(select){ case "+": result=txt1+txt2; break; case "-": result=txt1-txt2; break; case "*": result=txt1*txt2; break; case"/": result=txt1/txt2; break; } document.getElementById("fruit").value=result;}</script></head><body><input type='text' id="txt1" />?? ?<select id='select'> <option value='+'>+</option> <option value="-">-</option> <option value="*">*</option> <option value="/">/</option>? ?</select>? ?<input type='text' id='txt2' />?? ?<input type='button' value='=' onclick="count()" /> <!--通過 = 按鈕來調用創建的函數，得到結果-->?? ?<input type='text' id='fruit' /></body></html>
哪里錯了呢？
慕標9732067
2018-03-20 21:48:00
